Fix up all the easy virtual ... SK_OVERRIDE cases.

This fixes every case where virtual and SK_OVERRIDE were on the same line,
which should be the bulk of cases.  We'll have to manually clean up the rest
over time unless I level up in regexes.

for f in (find . -type f); perl -p -i -e 's/virtual (.*)SK_OVERRIDE/\1SK_OVERRIDE/g' $f; end

BUG=skia:

Review URL: https://codereview.chromium.org/806653007
diff --git a/src/gpu/SkGr.cpp b/src/gpu/SkGr.cpp
index d1fc6f0..49d3c6b 100644
--- a/src/gpu/SkGr.cpp
+++ b/src/gpu/SkGr.cpp
@@ -122,7 +122,7 @@
 private:
     GrResourceKey fKey;
 
-    virtual void onChange() SK_OVERRIDE {
+    void onChange() SK_OVERRIDE {
         const GrResourceInvalidatedMessage message = { fKey };
         SkMessageBus<GrResourceInvalidatedMessage>::Post(message);
     }